The Lake Washington School District, which includes half of Sammamish, recently earned 100 percent transportation efficiency rating from the Office of Superintendent of Public Instruction.

Transportation operations were evaluated based on the number of students transported between home and school and the location of each school bus stop and related destinations.

The study showed the Lake Washington School District spends less per student on transportation than the eight other districts in the state with more than 20,000 students except for Kent School District.

Lake Washington spent $282.73 per student in 2010-11 (the latest year for which comparable data is available) compared to the $396.80 average for large districts. Kent spent $276.91 per pupil. Lake Washington’s expenditures also compare favorably with smaller school districts nearby, which range from the $274.14 per student spent by Bellevue to $411.96 by Issaquah.